# Firmware update 2.1.9 - z sensor stopped working **URL:** \ **Category:** Sovol SV08 MAX\ **Tags:** firmware\ **Created:** [December 29, 2025, 12:28am UTC](https://forum.sovol3d.com/t/firmware-update-2-1-9-z-sensor-stopped-working/9303 "2025-12-29T00:28:31Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![cardoc](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@cardoc](https://forum.sovol3d.com/u/cardoc)\ **Post date:** [December 29, 2025, 1:16am UTC](https://forum.sovol3d.com/t/firmware-update-2-1-9-z-sensor-stopped-working/9303/3 "2025-12-29T01:16:40Z")
The max has no pressure sensor. In typical Sovol fashion the firmware is only available at the (semi-secret) OTA link. You should be able to force a OTA reinstall from the Sovol UI on the touchscreen. The Z offset is determined using the eddy sensor. As the eddy moves closer to the bed the output frequency changes at a steady rate. When the nozzle touches the bed there is a momentary fluctuation in the eddy output. **Power down** your printer and make sure both ends of the cable to the eddy are firmly inserted. Several users have reported loose connections, likely due to vibrations during shipping. > [@LDC1612 I2C bus busy error](https://forum.sovol3d.com/t/ldc1612-i2c-bus-busy-error/9111): > > Been printing non-stop with no issues until recently. Now I get this error on power up. Does anybody have any recommendations? TIA! --- _[View the full topic](https://forum.sovol3d.com/t/firmware-update-2-1-9-z-sensor-stopped-working/9303)._